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Sensors 2006, 6(7), 712-726; doi:10.3390/s6070712
Article

A Miniaturized Magnetic Induction Sensor Using Geomagnetism for Turn Count of Small-Caliber Ammunition

* , ,  and
Fuze Laboratory, Agency for Defense Development, Yuseong P.O. Box 35-5, Daejeon 305-600, Republic of Korea
* Author to whom correspondence should be addressed.
Received: 25 May 2006 / Accepted: 21 July 2006 / Published: 24 July 2006
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Abstract

This paper presents a miniaturized magnetic induction sensor (MMIS), wheregeomagnetism and high rpm rotation of ammunition are used to detect the turn number ofthe ammunition for applications to small-caliber turn-counting fuzes. The MMIS, composedof cores and a coil, has a robust structure without moving parts to increase the shocksurvivability in a gunfire environment of ~30,000 g’s. The MMIS is designed and fabricatedon the basis of the simulation results of an electromagnetic analysis tool, Maxwell® 3D. Inthe experimental study, static MMIS test using a solenoid-coil apparatus and dynamicMMIS test (firing test) have been made. The present MMIS has shown that an inductionvoltage of 6.5 mVp-p is generated at a magnetic flux density of 0.05 mT and a rotationalvelocity of 30,000 rpm. From the measured signal, MMIS has shown a signal-to-noise ratioof 44.0 dB, a nonlinearity of 0.59%, a frequency-normalized sensitivity of 0.256±0.010V/T·Hz and a drift of 0.27% in the temperature range of -30~ 43°C. Firing test has shownthat the MMIS can be used as a turn-counting sensor for small-caliber ammunition,verifying the shock survivability of the MMIS in a high-g environment.
Keywords: fuze; geomagnetism; magnetic induction sensor; turn count. fuze; geomagnetism; magnetic induction sensor; turn count.
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Yoon, S.-H.; Lee, S.-W.; Lee, Y.-H.; Oh, J.-S. A Miniaturized Magnetic Induction Sensor Using Geomagnetism for Turn Count of Small-Caliber Ammunition. Sensors 2006, 6, 712-726.

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